DeepSeek Tests 1M-Context Model

🔑 Key Takeaways

•DeepSeek expanded its production model's context window from 128K to 1 million tokens on February 11, 2026, confirmed by user observations and community testing showing over 60% accuracy at full 1M length.[1][4][5]
•The 1M token context is available in DeepSeek's web and app versions, enabling reliable fine-grained information retrieval even for low-frequency details in ultra-long texts.[1][4]
•Testing demonstrates high effective context utilization, with accuracy remaining stable up to 200K tokens and declining gently thereafter, outperforming Gemini series models.[4]

📊 Competitor Analysis▸ Show

Model	Total Parameters	Active Parameters	Context Window	SWE-bench	API Cost (Input $/1M tokens)
DeepSeek V4	1T	32B	1M	80%+ (claimed)	$0.27[3][1]
GPT-5.2	~2T (est.)	Full	256K	78.2%	$15[3]
Claude Opus 4.5	Undisclosed	Undisclosed	200K	80.9%	$15[3]

🛠️ Technical Deep Dive

Context Window Expansion: Silently upgraded from 128K to 1M tokens on Feb 11, 2026; maintains >60% accuracy at full length with horizontal accuracy curve up to 200K tokens.[1][4][5]
Engram Conditional Memory: Confirmed O(1) hash-based static knowledge retrieval, jointly developed with Peking University.[1][2]
Dynamic Sparse Attention (DSA): Leaked mechanism with 'Lightning Indexer' reducing compute overhead by ~50% for million-token processing.[1]
MoE Architecture: ~1T total parameters, ~32B active per token (more efficient routing than V3's 37B); combines with Engram and MHC.[1][2][3]
Manifold-Constrained Hyper-Connections (mHC): Addresses training stability at 1T scale; claimed 1.8x faster inference.[1]
Other: Runs on dual RTX 4090s; open-source weights under Apache 2.0; focuses on text modeling and info compression.[3]

🔮 Future ImplicationsAI analysis grounded in cited sources

DeepSeek V4's 1M context and 1T MoE at 10-40x lower inference costs than Western models could enable economically viable long-context tasks like full codebase analysis, reducing API spend by up to 72% in hybrid workflows while challenging OpenAI/Claude dominance with open-source efficiency and coding prowess (e.g., 80%+ SWE-bench).[3]

⏳ Timeline

2026-02

DeepSeek silently expands production model context window to 1M tokens (Feb 11), begins testing in web/app (Feb 13). Confirmed via users and >60% accuracy tests.[1][5]

📎 Sources (9)

Factual claims are grounded in the sources below. Forward-looking analysis is AI-generated interpretation.

DeepSeek Tests 1M-Context Model

⚡ 30-Second TL;DR

🧠 Deep Insight

🔑 Key Takeaways

🛠️ Technical Deep Dive

🔮 Future ImplicationsAI analysis grounded in cited sources

⏳ Timeline

📎 Sources (9)

Key Points

Impact Analysis

Technical Details

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